The ornamental design for a hat, as shown and described.
FIG. 1 is a front perspective view of a hat, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a rear perspective view thereof.
The even length broken lines on the hat depict stitching and form part of the claimed design. The dot-dash broken lines in FIG. 7 that extend to the solid lines and the unshaded areas between those lines define portions of the hat that form no part of the claimed design.